Electric-arc-welding tool



Oct' 4 1927' w. D. cHRlsTr-:NSEN

ELECTRIC ARC WELDING TOOL.

Filed June 29, 1925 invento 55 gages the chuck 10 Tas ra'rau'l OFFICE.

'WALTER D. CHBISTENSEN,OF PUEBLO, COLORADO.

ELEC'JJiBfIC-ABCl-'WELDING4 TOOL.`

, application inea :une as, 1925. serial ne. 40,402.

This invention relates to the art of electric arc welding, and more particularly to the electrode chuck or holder through which the travelling electrode is fed to the work.

object of the invention is to rovide an im roved chuck or holder that w' 1nsure,re lia le contact with the travelling electrode; A further object is to provide'replaceable resilient `contact jaws between or *withinl which the travelling electrode passes, and

which present an extended frictional contact surface to the travelling electrode A further object is to2 provide a hght,

small, compact, welding tool or chuck or holder, that provides ample electric contact wit-hlthe travelling electrode without'over- `heating and'sticklng4 to the electrode, and

that presentsl asubstantially. uniform frlcf tionall engagement with the electrode over a ,'20 long period of time.

In the accompanying drawings, Figure 1 illustrates the weldlng tool connected with a .conventional system of mechanical feed for the travelling electrode;

Fig. 2 is a sectional view of thechuck shown in Fig. 1; A

F igs. 3 and 4 are views of the parts of the tubular casing of the chuck;

Fig. 5 is a view in elevation of one ofthe 80 frictlonal contact plates or jaws used wlthin. the chuck; Figs. 6 and 7 are a pair of lspring lates that serve to maln-v tain the contact p ates in frictional engagement with they travellingelectrode;

Fig. '8 is a view of a cross section of the chuck on the line 8-8 of' Fig. 2;

Figs. 9 and 1() are views oflongitudmal A and transverse sections of a modified chuck 4o made 'of one piece of metal, and provided with integral resilient yjaws,`and s howmg'the electrode therein.

In Figure 1, a supply of metallic electrode 1, is fed-by the wer-driven feed-rolls 2, 2 through the flexible cable 3 which connects the casing 4 with thawelding tool 5. Electric current is suppliedbrthe welding tool4 5 through the conductor 6 from any suitable source. The motor 7 is suitably conntrolled. 5o by regulating devices, not sh'own, which in` turn are controlled by the operator through the manipulation of the istol-grip switch 8 in customary manner. llhe gri `8 is'provided with an adjustable clamp s which en- Vwith the travelling electrode 1 plan and edge views ofJ` ing suliicient resilience toenga e the traveland said groove The chuck 10 consists of a chambered casing 11, which may be made in two or more parts, 12, 13; the part 12 being provided with a threaded end 14h44 which it is attacliedy to *the clamp 9, an a threaded end 60 15 which engages the nozzle end 13. Within the chamber of the casing are the friction. plates or jaws 16, provided with a groove or channel 17 in which the lelectrode 1 travels. The jaws 16 of which two are preferably used, are maintained inl frictional contact by means of stllf springs 18, 18, which preferably have 4the shape shown in Figs. 6 and 7. When assembled'jthe springs 18 maintain the jaws 70 16 in uniform frictionalfengagement with the Atravelling electrode 1, providing excellent sliding electric contact.

In Figs. 9 and 10 a modified chuck is shown, consisting of a single piece of springtem ered steel tubing 20, preferably caseh'ar ened and provided w1th a screw thread 21, and with several slots 22, dividing a considerable portion of the chuck into relatively long resilient jaws or sectors 23. Theresilient `jaws 23 are so shaped aslto frictionall engage the electrode 1 for a considerab e lengt thereby providing good electric contact. In use, the chuck 20 1s screwed into the istol-grip clamp 9, in place of the chuc 10. Each of the above types of contact .jaws provldes' a long resilient surface frictional contact arallel with the surface ofthe travelling e ectrode; the contact plates presentling electrode and make agoo sliding electrical contact therewith.

I claim: A1. In a. welding tool, a detachable' chuck, co-operatlng jaws therein, said jaws :provided with a groove, means to retain said jaws under com resslon toward each other,

d ing between the approachr mg surfaces of the cooperatin jaws.

^2. Inl awelding tool, a detac ab lick having separable parts, coopera jaws4 within said chuck providing an. extended contact for an electrode therebetween, and spring members holding said jaws under 106 compression toward each othe l In'testimony whereof I aliix mysignature.

WALTER D. oHmsTENsEN. 

